DirectCommand: multiaddr not working

[alexcos20]

When issueing directCommands, you should be able to specify multiaddr if you want to deal with another node and that node address is not in peerStore/DHT.

Now it fails with 500

PS: if you pass multiaddr as array, it works:

{
    "command":"jobs",
    "jobId":"abb5b55ad429c57dd2e2f73541b233b972a5c2c1f5c5ca99fff0bb200d67aafd",
    "node":"16Uiu2HAm94yL3Sjem2piKmGkiHCdJyTn3F3aWueZTXKT38ekjuzr",
    "multiAddrs":["/ip4/157.66.255.31/tcp/9000"]
}

so we just need to make sure that we validate the request and give a nice error message